Output Ripple & Noise; Remote Sensing Function; Series Operation - TDK-Lambda RDS-A Series Instruction Manual

6-8.Output Ripple & Noise
The specification for maximum ripple & noise value are measured according to measurement circuit specified
by JEITA-RC9141B. Output Ripple & Noise level will be large when a load line is long. In such case, it might
be necessary to connect electrolytic or film capacitor across the load terminal. The output ripple cannot be
measured accurately if the probe ground lead of oscilloscope is too long.
Output
Terminal

6-9. Remote Sensing Function

Remote Sensing function is provided only RDS100A & RDS180A.
This function compensates voltage drop of wiring from output terminals to load terminals.
Connect "+S" terminal to "+" terminal of load and "S" terminal to "-" terminal of load with sensing wires.
The total line voltage drop shall be less than 0.3V. In case that sensing line is too long,
it is recommended to connect electrolytic capacitor in Across the load terminal.
Connect "+S" terminal to "+V" terminal and "-S" terminal to "-V" terminal with the attached short Pieces
when remote sensing function is not used.
If disconnected, OVP function may trigger and voltage will be shut down.

6-10.Series Operation

For series operation, either method (A) or (B) is possible.
(A)Series Operation RDS-A to One Load
Output
Terminal
Output
Terminal
Please select a bypass diode with maximum forward current rating more than output load current.
And maximum reveres voltage must withstand each power supply output voltage.
R=50Ω, C=4700pF Ceramic cap.
Coaxial Cable
1.5m 50Ω
Band width：100MHz
(B)Series Operation both RDS-A & Load
Terminal
Load
Terminal
<Page> 13/17
TDK-Lambda
RDS-A Series (24, 48VDC Input)
INSTRUCTION MANUAL
Load
R
Oscillo-
scope
C
Output
Output
Load
Load